The shutter fires correctly at all speeds except 'O'.
When the shutter is released at 'O' setting, the shutter stops midway because the bottom roller becomes too fat and the wound cloth rubs against the body casing. A slight push on the roller and the shutter is wound up.
As you can see, the spring has 'juice' and the cloth seems tightly wound on the roller.
This problem appeared suddenly : it was working perfectly till now.
Help welcome...
